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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1265688dc5b8b02dd1579dd0ec31baa51ea32c160261ea03a9d643e8805379f1' 
  AND token = 'XjvVyiXmz0bX0j+6+mgqcO10uRkfyEf4Z2uAHioMgn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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