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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f128f7556079b811a8f8df1a658f70db9b04182981aa551fe6bdb602f9f11489' 
  AND token = '8r68c7uTosRYl8rDN+L00sz9o5uoAm+nue4O+8JiVnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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