SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2bda32f05a69f4cc7ef49a4f8dcee774ecf72e4961764333048921f23983a302' 
  AND token = '0kzqhZtjsw/UhJ3r/y9fsVYLrY4tdl7T+6WKL0Gb3RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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