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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8331e9a5d304c5b31c12dc51b097db29c7a33dd854dd0e784b6598772c6f89c3' 
  AND token = 'i8FP/yN5vDDPHNV31+kiiYRKYg10pc6z0fPLvuoARwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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