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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e3427a9c98451b94cc47e642b0001e45a06e6f725551b9c6c6d91b3436862dc' 
  AND token = 'xcy8DTy/az32sWxBxk9feO6RkmQkbtUE5AFiIzvlyxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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