SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f52a4a753b4b68174f1fd2c172fac34f81985b350bc8617ef7cc7266d3a9f22' 
  AND token = 'ihzvW7b80ec3YM7xgQZmroEdFq86wUGlk/p5qAxkvDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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