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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1f966f0a15c931dc674b292f91ede6a6827bae47667aca52604867c7bd54234' 
  AND token = 'g1jiX4p8YxtFBNMeggPwQfVs/K9rTslorRrJ8OeSfe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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