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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb71470a3f9559d207464e2ff51e65444c5c700a480b581efe672b043a577015' 
  AND token = 'x/Bi7Mi3ApDewAwpwwkuenONIyuEqYecVYV+KVsICGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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