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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff22eafe3918dc9eac3697f3f6b1b9d8883adb20b3a535181af0ffc634cc9f80' 
  AND token = 'lsUsQPnaUREAxGO9b/aNNghSsVv7UFHj0hFLFcwleH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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