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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c081beedc09a8d366607681cc7576c5840a45bbdbac7c6a8bf0175bb8c27f0a' 
  AND token = 'uVG9N/88euqo3xtxaSG0NtULJHMh/oYbjtuVKMCbKx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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