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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5375bff26ad35cc7a5b1236ace901cbbcf08b1a84c51ce174dd7119d4a1be59d' 
  AND token = 'YbjjVG7XLMYFYNqjkSgvk1H4bXDbIjYJ5Q6Do2BexUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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