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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c3beeba45a15ff4f154f25a0295da8624d7b0cd89aa165ae99e8973dc34db31' 
  AND token = 'SPmHrgWoy4FZn9m9UewMXa2UgmybbFDH7I2CC8xakrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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