SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0885a4402002e4549b261ef5ef83583085aaafc84f28501d10b9b46c67625499' 
  AND token = 'xQPA09jvBh8+GgF/mFddw5APGZ+Bp7fLmFbJ8tJlZRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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