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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7843c52d44b4d760012ae27a8a062eab70a44983a381fdfa4aba309ffffd57e3' 
  AND token = 'fqxgR1Xga01ZJ7deaUxxlmLtXXsM1LUPECH4VqnA6c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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