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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '589b89da62e2aee57f96365d7c9e0e9e3f5d1849a495f9e774b95a93c7ac99ef' 
  AND token = 'DcBMy8iIOwRFm4IgU9LfU5iJa2h0zuVD8VophwnfZf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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