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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91f191f4386f1e9b6c3dd47e98d204de608ad4cd963329981effff8f48f04549' 
  AND token = 'WoMUR9TMq+jB1B+gq4tYERZr67g1mqpV0gdrCkzV8zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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