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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a0c433f8f44547076fca3805dd6dc3fae06789b4d84b9c00816776b230d51e0' 
  AND token = '/BXw9JSxeDmeJaMOWK+HZxRSZHer02eUNcKibyqkkj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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