SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54b3190cf2a0a20f8cffb9a87d9855a3377683043600f491275d54bc5417c8d0' 
  AND token = '4KeG0Yq1WyywusLlbiltN9VZUDALRnzG4uogWPkZsz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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