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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08b4044e4f2374e094c77d44e7a82c81d7f48c3a4b439729bf759f7583eca955' 
  AND token = 'kwT7lUYElEyR0BnY41o7AhhSV8twMEBatDy/JmsiNjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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