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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db3d7ab115a01edb174bd8516b0cada0efc5ebea5a6687eb3ed71bc0300404e2' 
  AND token = '29IOYuDkegDrD9O3syA4nZqYW9pX2okG50xZq5mjSdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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