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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51f7a64382eb5dc61bc71c44623c24f18d34aec6588dfd0b8a6326c85cf8e189' 
  AND token = 'iRXWA2RogT/xbi9Z2II4gudmnO8kUNqlQbvDSH5M268=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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