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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb146c6baffb71861e494d9b8f9bf986b66c19393cb408966f7cf312ce2879f6' 
  AND token = '6HUZ+h9KB5BacthR3HX241lkjPu0l/y5KXVKaLy5ieY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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