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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d8d55fecc9be9a20a8909c71524420ea55ed2db55616865ab2a7529582429e3' 
  AND token = '0D5rvyy2vgIu3haGobaKIUGKrVpjj1xBJmg4GDcsY2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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