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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e54f6a619963cd4e8f4026f27e3147b6b15171d810bb8debd3b36a9b3eccbd03' 
  AND token = 'Fs6j4P9Ex0LFELkzjneGHVcK/tQIBKE7xAudvQxr5hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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