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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1f1d75de60fc447755092a0483cef8affd5ffef4c69e5622d2e7cda7ca4cf80' 
  AND token = 'FuIJQJo4xpiOZO/jmUu8aEcuA68JQHKpd8BBNVEkrzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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