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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8eba25ffb114c977bebe6020c3fa617045dd9ff7801d03ab3c6b654d3d6846f1' 
  AND token = '79NlN0ewQ3QXSSlnG9sQJqroYxsyfvHu3VH4nOAHDmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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