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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddbd1640beb205f45075652200cea5700607412e01b0bec429b5dfa27c91b5d5' 
  AND token = '8UY508Pb1FCwedN5M3prhZxqRb1xhp1mR7LbeN0Use0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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