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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1775c3c692926c44f2a4447074e2193aa725c1420a5173ee044fa32b9342c0ff' 
  AND token = '0HpJeXTLD0EQu8owcsQUJDlgf+c2DAGdzIyMtXl7gck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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