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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dcbe6056ec852467a50fc367e44b0e7261d9dea29d25aceefb6f52c61941719' 
  AND token = 'Aes3d5JZvuYMj4KfzBGy9+baI7nal1gC52fbyFpS1YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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