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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4168c3753fd264524ac2c6c717c67637341888a0da6370a5f031577aceea34da' 
  AND token = 'fGE6upPNGqf5JVoG0pe3sdGQ3RAXe7W+I34OD5qkNEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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