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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2aad39c68cb0e124cb9057e81625caee5567e8353e827397fc96b84a4e495981' 
  AND token = 'xiFInc8wC0G5N4HCwqmC8s1xXZ8sD+LuyPu/VDH8HZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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