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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ab12f7a3a2a860a5ef8a777c80c3f6027a55e3b3aac6e9ac657e55545e35c22' 
  AND token = 'KVbB94Ml5Po/87aV4b9qfSws5GSZcqp6L3dNSoGdFNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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