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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c388de41eac6cdc28996ccb330d06ac759652635d448eeae96627bd55ddb9a7' 
  AND token = 'zad1o/osAKPgPeBtU2VnV7e4rMIstLRgN7aTpwRun7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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