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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a94793681d385dcbc6429c47c93107ef458e7233872db1daae86bbeec1d35f1' 
  AND token = 'ZoafX7AXmueFddSn130n8TaUbmO0uvxe382jhk3nMhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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