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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0106e05e47cb0a29f2d20eee2f7b1f48828ed39c9b7a6ab74ba9e7c9578c3493' 
  AND token = 'g7o+JJ8+EjjThOMoAe1+cMoEIApolVBEa0vlxEnugzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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