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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77d07de485dc8e437d66ddc944d48c1dbfa82118e00c7d2bf4f68b2a3f64354d' 
  AND token = 'YlT/wsV+7kvlxUJl8mNYYrR4jnkyi9IAbXtoas5hbYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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