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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b65366dd3aa99d50a25c86f6a5fbcd562029a2e3ddd4e0db9fd66ea4d03e1a3' 
  AND token = '0nar4URB8dI0D9mUuYmgwLE4Gj8B8VXUmDU2D2ZoXqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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