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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cae6c75f75dd1780a1a375aba12aca72a76e8f989de3441cda20be35f8b64d8' 
  AND token = 'FnbJd0hhODtMhO2aq1rNWpukYYW8gRzlLg1UOMyEEpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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