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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01583eb3b7e34609b84ea4a3d40f687830af64106d4e372a066f404a40ae107e' 
  AND token = '9ZrBsqDThM+ZIxpg6ICubrQtAsZ18vrW4sUs1ar7ilY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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