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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df95c45efa18225c9a9f06b671e482e42d20b0cf3b68bc4556ef505e1f36592a' 
  AND token = '8MwtnkIdWfAimjoiFxSF+TBFkzXQDyfqXqP97fmfb7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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