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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e85d5ca2e0a214f0374b89dea12306c7a805dea98645319df1bfb58abefe0df9' 
  AND token = 'oVNhA6WvkvLZwAXWno15CTtFM/CNGVuGMUMFAL4oPwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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