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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc4d99e97fc7a78b0dedf49796007a812a5227b8cd5bb48675d32cd5c8723dbd' 
  AND token = 'byuAdLfkpHUVtc6cxRFfaEVcwSnIViVMiVz/gZOaZZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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