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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb8d92b120111ba1e24ed79eb6b5c99d4b502e28b07f3b58fbc27c418168b442' 
  AND token = 'G5bP/8TX3h/9uJJDNJZzyT4GF5NToPs0D6GDMVe6l4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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