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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daa745c8ee2cebdc1b0699ebf96808b119c1f3c0d93b43f52d462e97aa50ce68' 
  AND token = 'u7Fwc8ABm5hlWQJ72dax3sYpm5hp1QcOkGF9gU8Mvgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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