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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a68cf7e7f13921fd12933399c1f7a7764e83062c07f736a9afb9e0d4273373ce' 
  AND token = 'SsNhIbXl+6SjutnJ91Jd2iTAqm3TrcQ6eKDohGx5jfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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