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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91b7f51e5bdacc01a4427e25db4656ecc4f3f9504275b8eae4aa63e9c76cbe33' 
  AND token = 'fIWxTJ1YLCT4y5oUB1XHr++99Bd9ytL6oNeCihadNG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00144

JSON explain

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