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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e320333c876671c132bb55bd0d847791bcd108fedecfb3b644c535604acab0b9' 
  AND token = 'fp+ZEBRPDjH7tG1673Y0FeDx1xIr7Gj+l1HS4DE7rBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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