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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd9fe379b0c85a252eab0a272df94a8a47f4d4855014b48479bc826d52b7f9a4' 
  AND token = 'F7WvF/iB5D4S+faGZQAJLKo3S+kCdkPoO9OftZf3wMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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