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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd943902dd19f3edc25f30a84a03ce3dbdf3a52b9823b23421318a4070d44b204' 
  AND token = 'O9cYuWDDYmVWPkAa+4JF2B+7dWAlpbkTmb3qBpGQdSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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