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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8c5f891638b695d60bce778ca1847d509fad8ed0eb3d302697bb9018e5a8156' 
  AND token = 'Zgoc/y7SUxIfYD0ICpFWbjzesue79Ze9ptxYgrBq7xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}