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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dceae2d7bc05ff04229c31ece74147dd50f14eae578eacb7d542fff3e96b455e' 
  AND token = 'GHyaqeTG+L6NbuC4jR005/zhC0AZGV1wdSJ/gVCUoLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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