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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91ba049d605babea9c30cd599f052b5d594aa876100daff75d4371fc92acc745' 
  AND token = 'IUT9qG7fqYsB202HVA/vwtWHK4QXHA2UfDoy8Ivv5TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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