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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f960bbfb7d4df25c3c4d97d71ecaeb31455d31792cc2dc81e1e4e266ad7c5bd' 
  AND token = 'ES2mXtH6Acl3d5VMn8B16GEVodPcmeL77cNS6MYxi90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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