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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b547d88272a5a9a487172232f08b4d6fd94ddcd0d483c2fbeac0a12f2f476d35' 
  AND token = '6S8f4dpeeguBzbODMp29UmmrgO2qMi2529T1yDBIZ7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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