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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67ce512c25c0a4402bc9b1fa3cddec83087d54578a3c733165461c4b428e7dc7' 
  AND token = 'ONDU2SdbAxAVi6dzrzO5BQFOZ9lkSzb0OlcVOSz+ysg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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